1. Schematic of North American Dräger AV-E hanging bellows ventilator during inspiration. Solid gray area represents driving gas under pressure, which comes from ventilator control circuits, enters bellows housing to compress and empty the bellows, and pressurizes and thereby closes ventilator pressure relief valve. 1, Bellows housing; 2, bellows; 3, tidal volume adjustment plate; 4, tidal volume control knob; 5, relief valve pilot line; 6, ventilator pressure relief valve; 7, connector to patient circuit; 8, connector to waste gas scavenging system.
Source: Anesthesia Delivery System, Anesthesiology, 3e
Citation: Longnecker DE, Mackey SC, Newman MF, Sandberg WS, Zapol WM. Anesthesiology, 3e; 2017 Available at: Accessed: October 22, 2017
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